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Preparation and surface effect analysis of trivalent europium-doped nanocrystalline La2O2S
Authors:Peng Hongshang  Huang Shihua  You Fangtian  Chang Jianjun  Lu Shaozhe  Cao Lin
Institution:Institute of Optoelectronic Technology, Beijing Jiaotong University, 100044 Beijing, China. hillphs@sina.com
Abstract:La2O2S:Eu3+ nanocrystals (NCs) with a mean size of 18 nm are prepared by gel thermolysis. The morphology of the particles is hexagonal. The surface Eu3+ ions are first detected by time-resolved spectra in the 5D0 --> 7F1 region. Because the symmetry of the sites occupied by surface Eu3+ ions is lower, the 5D0 --> 7F1(E) line, which is doubly degenerate in the bulk crystal, is split, and the fluorescence lifetime becomes shorter. The results of the laser-selective excitation indicate that the degradation of the site symmetry of Eu3+ seems to be abrupt, which means the as-synthesized La2O2S:Eu3+ NCs might be of the La2O2S/La2O(2-x)S(1+x)core-shell structure and the shell are not in a disordered state but a rather pure one.
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